{"id":"GHSA-38c7-23hj-2wgq","summary":"n8n has Webhook Forgery on Zendesk Trigger Node","details":"## Impact\nAn attacker who knows the webhook URL of a workflow using the ZendeskTrigger node could send unsigned POST requests and trigger the workflow with arbitrary data. The node does not verify the HMAC-SHA256 signature that Zendesk attaches to every outbound webhook, allowing any party to inject crafted payloads into the connected workflow.\n\n## Patches\nThe issue has been fixed in n8n versions 2.6.2 and 1.123.18. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Restrict network access to the n8n webhook endpoint to known Zendesk IP ranges.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","aliases":["CVE-2026-56360"],"modified":"2026-07-09T04:11:38.193852913Z","published":"2026-02-26T22:47:06Z","database_specific":{"cwe_ids":["CWE-290"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-02-26T22:47:06Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/commit/3839e310bd4c3002c646c363d1411916fa195151"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/commit/c6520e4e87614fa60c9433e93019e211f19f65f9"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"}],"affected":[{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.123.18"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-38c7-23hj-2wgq/GHSA-38c7-23hj-2wgq.json"}},{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.6.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-38c7-23hj-2wgq/GHSA-38c7-23hj-2wgq.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"}]}